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Merger - Additional Information (Detail) - UCB and United Community Bank [Member] $ / shares in Units, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 11, 2018 Bank $ / shares shares | Mar. 31, 2018 | Dec. 31, 2017 USD ($)
Business Combinations [Line Items] |  |  |
Date of acquisition agreement |  | Mar. 11, 2018 |
Number of banking offices acquired | Bank | 8 |  |
Total consolidated assets | $ |  |  | $ 546
Total loans | $ |  |  | 296
Total deposits | $ |  |  | $ 462
Per share common stock | $ 1.027 |  |
Per share cash consideration | $ 2.54 |  |
Stock options outstanding | shares | 212,563 |  |
Share price per share | $ 26.22 |  |
Aggregate cash consideration to be paid | $ 13,600,000 |  |

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